Gill (Na+, K+)-ATPase from the Amazon River shrimp, Macrobrachium amazonicum (Decapoda, Palaemonidae): effect of exogenous biogenic amines on enzyme activity in juveniles and adults

Autor(es)

Lucena, Malson N. ; McNamara, John C. ; Leone, Francisco A.

• Tipo de documento: Artigo Científico
• Fonte: Hydrobiologia; v. 789, n. 1, p. 59-76, MAR 2017.
• Citações Web of Science: 5

Resumo

Despite the biological and economic importance of the freshwater shrimp Macrobrachium amazonicum, a role for biogenic amines in the osmoregulatory capability of this diadromous species remains unstudied. This investigation provides an extensive kinetic characterization of the effects of the exogenous polyamines spermine, spermidine, and putrescine on (Na+, K+)-ATPase activity in gill microsomal preparations from juvenile and adult shrimps at varying concentrations of ATP, Mg2+, Na+, and K+, and on inhibition by ouabain. (Na+, K+)-ATPase activity in both juvenile and adult shrimps is inhibited by spermidine (60-95%) and putrescine (40-70%) while spermine has a negligible inhibitory effect (< 10%). Putrescine affects the kinetics of ATP hydrolysis and enzyme affinity (K (M)) for ATP in both enzymes, while spermidine alters specific activity only. Spermidine increases Mg2+ affinity of the adult (Na+, K+)-ATPase while putrescine decreases Mg2+ affinity in both enzymes. Spermidine decreases Na+ affinity by ae50% in both enzymes, while putrescine increases affinity of the juvenile enzyme twofold. These biogenic amines cause slight changes in K (M) values in both enzymes. These findings suggest that the effect of biogenic amines on gill (Na+, K+)-ATPase activity and kinetics may be species and stage specific. (AU)

• Processo FAPESP: 13/22605-1 - Caracterização cinética e molecular da (Na+,K+)-ATPase do tecido branquial do caranguejo Cardisoma guanhumi (Latreille)
• Beneficiário: Francisco de Assis Leone
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/17534-0 - Papel da (Na,K)-ATPase na osmorregulação e excreção de amônio em crustáceos eurialinos: identificação e efeitos do FXYD2 na regulação da (Na,K)-ATPase branquial do siri Callinectes danae
• Beneficiário: Francisco de Assis Leone
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/24252-9 - O papel da (Na+,K+)-ATPase na capacidade osmorregulatória do caranguejo Ucides cordatus: uma abordagem bioquímica e molecular
• Beneficiário: Malson Neilson de Lucena
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado